determining the frequency to port it at will be math stuff, but you defineatly wanna figure out when the waves add completely and tune to that frequency. In normal 6th order BP you tune the 2 chambers 5-10 hz apart to get a large peak between the two tuning points, however if you can figure out exactly the frequency that both outputs(front and back of cone) sum you can then une to that frequency.

the problem is with the horn/port thing. I am not sure exactly how it works, seeing as how it is flared port.

There are people on another forum I am talking to who actually know how to model exponential ports so I am talkign to them.

I figured out the chambers rough sizes though for a scaled up to 50 inch square. the rear chamber(sealed) is 393.75 square inches and the front chamber is 312 square inches. thats square so whatever the heighth is minus driver displacement...

I keep getting mixed coments about the WOs actual box type, some people say its clearly a horn, but its small size makes it a lesser horn(in efficiency). Others say it is a 4th order BP with an exponetial port.

If it is a horn, when you stack them you increase efficiency nto only by 4 db for doubling power, but by 6-9db for some reason.

Another option for porting would be out the front, rather than worry about the horn path at all, simply vented out the front would allow you to focus on the summation of the waves.